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Phase-field method for growth of iron whiskers in the presence of CO gas convection

  • Feng Lu
  • Liang-ying WenEmail author
  • Xu Han
  • Wen-huan Jiang
  • Hua-mei Duan
  • Jian Xu
  • Sheng-fu Zhang
Original Paper
  • 20 Downloads

Abstract

A phase-field model for growth of iron whiskers that includes convection around a particle was investigated during the process of fluidized pre-reduction. In the simulations, the phase-field method was coupled with flow field and reduction of iron oxide particles. The results showed that the reduction rate at local place had significant effects on the iron ions diffusion and the iron whiskers were more easily grown on the area containing low mole fraction of oxygen. The growth of iron whiskers in the model was investigated in two important simple situations: a velocity change flow and a CO concentration change flow. Because of high reduction rate and low surface energy, iron whiskers were more easily grown on the windward surface and the length of iron whiskers increased with gas velocity increasing. However, both the length and numbers of iron whiskers increased with CO concentration increasing due to the more nucleation site of iron whiskers created by CO adsorbed. When the gas velocity is higher than 0.3 m/s or CO mole fraction is high than 0.6, the nucleation incubation time would be rapidly decreased, which could give suggestions to control the operational parameters in the fluidized pre-reduction process.

Keywords

Iron whisker Reduction Convection Phase-field method 

Notes

Acknowledgements

This work is supported by the National Natural Science Foundation of China (51374263, 51674052). The authors are grateful for the Chongqing Research Program of Basic Research and Frontier Technology (cstc2018jcyjAX0003), and National Natural Science Foundation of China (91634106, 51704048) is also acknowledged.

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Copyright information

© China Iron and Steel Research Institute Group 2019

Authors and Affiliations

  • Feng Lu
    • 1
    • 2
  • Liang-ying Wen
    • 1
    • 2
    Email author
  • Xu Han
    • 1
    • 2
  • Wen-huan Jiang
    • 1
    • 2
  • Hua-mei Duan
    • 1
    • 2
  • Jian Xu
    • 1
    • 2
  • Sheng-fu Zhang
    • 1
    • 2
  1. 1.School of Materials Science and EngineeringChongqing UniversityChongqingChina
  2. 2.Chongqing Key Laboratory of Vanadium–Titanium Metallurgy and Advanced MaterialsChongqing UniversityChongqingChina

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